London Airport: One of Russia's top physicists, Dr. Peter Kapitza (right) is pictured after her flew into Britain from Moscow today. The Doctor who is the director of the Institute of Physical Problems of the Academy of Sciences in Russia, said at the airport "It is wonderful to be back in Britain I shall be here about three weeks." He will lecture to the Royal Society and is to be presented with a medal by the Physics Society for outstanding work in this field. He is a fellow of Trinity College and from 1924-32 was assistant director of magnetic research at Cavendish Laboratories, Cambridge He is staying at Churchill College Cam bridges 28 April 1966